A kind of through-screen coarse slime sorting jig washing method

Abstract

A sieve-type coarse coal slime sorting and jig washing method relates to the field of coal preparation equipment. The method comprises the following steps: Step 1: laying an artificial bed; the thickness of the artificial bed is 300-600mm, It is divided into bottom layer, middle layer and upper layer; the thickness of the bottom layer is 100-200mm, the particle size of the bed stone is 10-12mm, and the density is 2.1-3.6g / cm 3 ;The thickness of the middle layer is 100-200mm, the particle size of the bed stone is 8-10mm, and the density is 2.0-3.0g / cm 3 ;The thickness of the upper layer is 100-200mm, the particle size of the bed stone is 6-8mm, and the density is 1.8-2.5g / cm 3 ; Step 2: close the valve at the discharge port at the bottom of the sieve type coarse coal slime sorting jig machine, start the dewatering screen at the bottom of the sieve type coarse coal slime sorting jig machine body; step 3: start the clean water pump to transport clean water to Main water pipe; step 4: start the electronic numerical control device, and adjust the parameters of the electronic numerical control device; step 5: transport the raw material of coarse coal slime to the raw material inlet of the sieve-type coarse slime sorting jig machine, and prepare for washing. The washing method is simple in operation, strong in adaptability, and the recovery rate can reach more than 95%.

Description

technical field [0001] The invention relates to the field of coal preparation equipment, in particular to a washing method with a sieve-type coarse coal slime sorting jig machine. Background technique [0002] With the further improvement of coal mining mechanization, there are more and more fine coals in the raw materials of coal preparation plants. In addition, secondary fine coals will be produced after crushing and other processes in the coal washing process. Because it is difficult to recycle, clean coal exists in coal slime and becomes "waste". The ash content of these coal slimes containing coarse clean coal is between 40-55%, and coarse-grained coal slime accounts for between 30-45%. At present, Domestic comprehensive utilization of these coal slimes is mainly used in power plants or coal gangue power plants for blending and distributing power generation, or stacked in the open air or buried on site, which pollutes the environment and wastes resources. [0003] In t...

AI Technical Summary

Problems solved by technology

The theoretical separation particle size range of dense medium and water medium cyclone is 50mm ~ 0.5mm, but the production practice shows that its separation accuracy for 3 ~ 0.5mm particle size material is poor; TBS, CSS, TCS and other interference bed separation The sorting machine is to mix the pulp material fed into the upper end of the sorting machine with the rising water flow, and form a relatively stable disturbed bed under the action of a certain period of time. The product flow; the density of the feed particles is higher than the average density of the bed, and the bed will pass through the bed due to its own weight, and enter the sinking flow from the tailings discharge port, so that the materials can be separated according to density; in practical applications, it is mainly aimed at 2 ~0.25mm coarse coal slime, the best sorting particle size range is 1-0.25mm (that is, the particle size ratio is 4:1), and the effective sorting density is 1.4-1.8g / cm 3 , its disadvantages are: the range of sorting particle size is narrow, if the feed particle size ratio exceeds 4 times, it will cause the loss of clean coal and cause the separation effect to deteriorate; in addition, a single rising water flow cannot form a stable interference bed, which will affect the separation effect ;The ash content of the sorted product is generally between 14-18%, and it is difficult to separate the qualified clean coal below 10% at one time; the ash content of the tailings is generally 50-60%, and 20% of the clean coal is still lost in the tailings

The spiral separator belongs to the principle of flow film separation, which relies on the characteristics of liquid flow. The coarse slime slurry is fed from the top of the spiral separator, and the coarse slime descends spirally in the spiral groove, and is driven by gravity, centrifugal force and water flow. The separation of minerals with different densities can be realized under the left and right of the force; the maximum separation size is 3mm-0.15mm; the advantage is that no power is needed, no moving parts, and it is suitable for thermal coal separation. The disadvantage is that when the separation density is low, it will affect the separation. The separation effect, the product quality is easy to fluctuate, and the separation accuracy is poor. The ash content of the sorted product is generally 14-18%, and it is difficult to sort out qualified clean coal below 10% at one time. The tailings ash content is generally 40-60%, about 20% of the clean coal is still lost in the tailings; therefore, the effective recovery of coarse coal slime can recover resources, protect the environment, reduce resource consumption, and is of great significance to the sustainable development of the coal industry. Coarse slime separation equipment and technology Innovation has become an urgent priority

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